| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <functional> |
| |
| // reference_wrapper |
| |
| // template <ObjectType T> reference_wrapper<T> ref(reference_wrapper<T>t); |
| |
| #include <functional> |
| #include <cassert> |
| |
| #include "counting_predicates.h" |
| |
| #include "test_macros.h" |
| |
| bool is5 ( int i ) { return i == 5; } |
| |
| template <typename T> |
| bool call_pred ( T pred ) { return pred(5); } |
| |
| namespace adl { |
| struct A {}; |
| void ref(A) {} |
| } |
| |
| int main(int, char**) |
| { |
| { |
| int i = 0; |
| std::reference_wrapper<int> r1 = std::ref(i); |
| std::reference_wrapper<int> r2 = std::ref(r1); |
| assert(&r2.get() == &i); |
| } |
| { |
| adl::A a; |
| std::reference_wrapper<adl::A> a1 = std::ref(a); |
| std::reference_wrapper<adl::A> a2 = std::ref(a1); |
| assert(&a2.get() == &a); |
| } |
| |
| { |
| unary_counting_predicate<bool(*)(int), int> cp(is5); |
| assert(!cp(6)); |
| assert(cp.count() == 1); |
| assert(call_pred(cp)); |
| assert(cp.count() == 1); |
| assert(call_pred(std::ref(cp))); |
| assert(cp.count() == 2); |
| } |
| |
| return 0; |
| } |